fix: ValueError on empty path query — filter like ZCatalog does (#97)

lineage.index passes path='' which ZCatalog silently ignores.
Now filters empty/blank paths before validation.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jensens

CHANGES.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.0.0b47
+
+### Fixed
+
+- Fix `ValueError: Invalid path: ''` when path query receives empty
+  string. Empty/blank paths are now silently filtered, matching
+  ZCatalog behavior.
+
 ## 1.0.0b46
 
 ### Fixed

src/plone/pgcatalog/query.py

@@ -483,6 +483,10 @@ def _handle_path(self, name, idx_key, spec):
         navtree_start = spec.get("navtree_start", 0)
 
         paths = [query_val] if isinstance(query_val, str) else list(query_val)
+        # Filter empty/blank paths — ZCatalog silently ignores them
+        paths = [p for p in paths if p and p.strip()]
+        if not paths:
+            return  # nothing to query
 
         if len(paths) > _MAX_PATHS:
             raise ValueError("Too many paths in query")